Androidにペルシャ語（ShamsiまたはJalali）カレンダーのライブラリまたはアルゴリズムはありますか？

Question

Androidのすべてのバージョンで、グレゴリオ暦（西部）の日付をペルシャ語（シャムシ）の日付に、またはその逆に変換します。

完全で信頼できるライブラリまたはアルゴリズムはありますか？

Answer 1

私はこのアルゴリズムを何年も使用していますが、1901年から2099年の間は非常に正確です。

それを使用してお楽しみください！ :)

public class Utilities {

    private class SolarCalendar {

        public String strWeekDay = "";
        public String strMonth = "";

        int date;
        int month;
        int year;

        public SolarCalendar()
        {
            Date MiladiDate = new Date();
            calcSolarCalendar(MiladiDate);
        }

        public SolarCalendar(Date MiladiDate)
        {
            calcSolarCalendar(MiladiDate);
        }

        private void calcSolarCalendar(Date MiladiDate) {

            int ld;

            int miladiYear = MiladiDate.getYear() + 1900;
            int miladiMonth = MiladiDate.getMonth() + 1;
            int miladiDate = MiladiDate.getDate();
            int WeekDay = MiladiDate.getDay();

            int[] buf1 = new int[12];
            int[] buf2 = new int[12];

            buf1[0] = 0;
            buf1[1] = 31;
            buf1[2] = 59;
            buf1[3] = 90;
            buf1[4] = 120;
            buf1[5] = 151;
            buf1[6] = 181;
            buf1[7] = 212;
            buf1[8] = 243;
            buf1[9] = 273;
            buf1[10] = 304;
            buf1[11] = 334;

            buf2[0] = 0;
            buf2[1] = 31;
            buf2[2] = 60;
            buf2[3] = 91;
            buf2[4] = 121;
            buf2[5] = 152;
            buf2[6] = 182;
            buf2[7] = 213;
            buf2[8] = 244;
            buf2[9] = 274;
            buf2[10] = 305;
            buf2[11] = 335;

            if ((miladiYear % 4) != 0) {
                date = buf1[miladiMonth - 1] + miladiDate;

                if (date > 79) {
                    date = date - 79;
                    if (date <= 186) {
                        switch (date % 31) {
                        case 0:
                            month = date / 31;
                            date = 31;
                            break;
                        default:
                            month = (date / 31) + 1;
                            date = (date % 31);
                            break;
                        }
                        year = miladiYear - 621;
                    } else {
                        date = date - 186;

                        switch (date % 30) {
                        case 0:
                            month = (date / 30) + 6;
                            date = 30;
                            break;
                        default:
                            month = (date / 30) + 7;
                            date = (date % 30);
                            break;
                        }
                        year = miladiYear - 621;
                    }
                } else {
                    if ((miladiYear > 1996) && (miladiYear % 4) == 1) {
                        ld = 11;
                    } else {
                        ld = 10;
                    }
                    date = date + ld;

                    switch (date % 30) {
                    case 0:
                        month = (date / 30) + 9;
                        date = 30;
                        break;
                    default:
                        month = (date / 30) + 10;
                        date = (date % 30);
                        break;
                    }
                    year = miladiYear - 622;
                }
            } else {
                date = buf2[miladiMonth - 1] + miladiDate;

                if (miladiYear >= 1996) {
                    ld = 79;
                } else {
                    ld = 80;
                }
                if (date > ld) {
                    date = date - ld;

                    if (date <= 186) {
                        switch (date % 31) {
                        case 0:
                            month = (date / 31);
                            date = 31;
                            break;
                        default:
                            month = (date / 31) + 1;
                            date = (date % 31);
                            break;
                        }
                        year = miladiYear - 621;
                    } else {
                        date = date - 186;

                        switch (date % 30) {
                        case 0:
                            month = (date / 30) + 6;
                            date = 30;
                            break;
                        default:
                            month = (date / 30) + 7;
                            date = (date % 30);
                            break;
                        }
                        year = miladiYear - 621;
                    }
                }

                else {
                    date = date + 10;

                    switch (date % 30) {
                    case 0:
                        month = (date / 30) + 9;
                        date = 30;
                        break;
                    default:
                        month = (date / 30) + 10;
                        date = (date % 30);
                        break;
                    }
                    year = miladiYear - 622;
                }

            }

            switch (month) {
            case 1:
                strMonth = "فروردين";
                break;
            case 2:
                strMonth = "ارديبهشت";
                break;
            case 3:
                strMonth = "خرداد";
                break;
            case 4:
                strMonth = "تير";
                break;
            case 5:
                strMonth = "مرداد";
                break;
            case 6:
                strMonth = "شهريور";
                break;
            case 7:
                strMonth = "مهر";
                break;
            case 8:
                strMonth = "آبان";
                break;
            case 9:
                strMonth = "آذر";
                break;
            case 10:
                strMonth = "دي";
                break;
            case 11:
                strMonth = "بهمن";
                break;
            case 12:
                strMonth = "اسفند";
                break;
            }

            switch (WeekDay) {

            case 0:
                strWeekDay = "يکشنبه";
                break;
            case 1:
                strWeekDay = "دوشنبه";
                break;
            case 2:
                strWeekDay = "سه شنبه";
                break;
            case 3:
                strWeekDay = "چهارشنبه";
                break;
            case 4:
                strWeekDay = "پنج شنبه";
                break;
            case 5:
                strWeekDay = "جمعه";
                break;
            case 6:
                strWeekDay = "شنبه";
                break;
            }

        }

    }

    public static String getCurrentShamsidate() {
        Locale loc = new Locale("en_US");
        Utilities util = new Utilities();
        SolarCalendar sc = util.new SolarCalendar();
        return String.valueOf(sc.year) + "/" + String.format(loc, "%02d",
                sc.month) + "/" + String.format(loc, "%02d", sc.date);
    }
}

Answer 2

これは、Javaクラスの方が使いやすく、信頼性が高いと思います。 イランのフォーラム で見つけました。これはJavaクラス：

package MyUtil;

import Java.util.Calendar;
import Java.util.GregorianCalendar;

/**
 * Title: Calender Conversion class
 * Description: Convert Iranian (Jalali), Julian, and Gregorian dates to
 * each other
 * Public Methods Summary:
 * -----------------------
 * JavaSource_Calendar();
 * JavaSource_Calendar(int year, int month, int day);
 * int getIranianYear();
 * int getIranianMonth();
 * int getIranianDay();
 * int getGregorianYear();
 * int getGregorianMonth();
 * int getGregorianDay();
 * int getJulianYear();
 * int getJulianMonth();
 * int getJulianDay();
 * String getIranianDate();
 * String getGregorianDate();
 * String getJulianDate();
 * String getWeekDayStr();
 * String toString();
 * int getDayOfWeek();
 * void nextDay();
 * void nextDay(int days);
 * void previousDay();
 * void previousDay(int days);
 * void setIranianDate(int year, int month, int day);
 * void setGregorianDate(int year, int month, int day);
 * void setJulianDate(int year, int month, int day);
 */
public class CalendarTool {

    /**
     * JavaSource_Calendar:
     * The default constructor uses the current Gregorian date to initialize the
     * other private memebers of the class (Iranian and Julian dates).
     */
    public CalendarTool()
    {
        Calendar calendar = new GregorianCalendar();
        setGregorianDate(calendar.get(Calendar.YEAR),
                calendar.get(Calendar.MONTH)+1,
                calendar.get(Calendar.DAY_OF_MONTH));
    }

    /**
     * JavaSource_Calendar:
     * This constructor receives a Gregorian date and initializes the other private
     * members of the class accordingly.
     * @param year int
     * @param month int
     * @param day int
     */
    public CalendarTool(int year, int month, int day)
    {
        setGregorianDate(year,month,day);
    }

    /**
     * getIranianYear:
     * Returns the 'year' part of the Iranian date.
     * @return int
     */
    public int getIranianYear() {
        return irYear;
    }

    /**
     * getIranianMonth:
     * Returns the 'month' part of the Iranian date.
     * @return int
     */
    public int getIranianMonth() {
        return irMonth;
    }

    /**
     * getIranianDay:
     * Returns the 'day' part of the Iranian date.
     * @return int
     */
    public int getIranianDay() {
        return irDay;
    }

    /**
     * getGregorianYear:
     * Returns the 'year' part of the Gregorian date.
     * @return int
     */
    public int getGregorianYear() {
        return gYear;
    }

    /**
     * getGregorianMonth:
     * Returns the 'month' part of the Gregorian date.
     * @return int
     */
    public int getGregorianMonth() {
        return gMonth;
    }

    /**
     * getGregorianDay:
     * Returns the 'day' part of the Gregorian date.
     * @return int
     */
    public int getGregorianDay() {
        return gDay;
    }

    /**
     * getJulianYear:
     * Returns the 'year' part of the Julian date.
     * @return int
     */
    public int getJulianYear() {
        return juYear;
    }

    /**
     * getJulianMonth:
     * Returns the 'month' part of the Julian date.
     * @return int
     */
    public int getJulianMonth() {
        return juMonth;
    }

    /**
     * getJulianDay()
     * Returns the 'day' part of the Julian date.
     * @return int
     */
    public int getJulianDay() {
        return juDay;
    }

    /**
     * getIranianDate:
     * Returns a string version of Iranian date
     * @return String
     */
    public String getIranianDate()
    {
        return (irYear+"/"+irMonth+"/"+irDay);
    }

    /**
     * getGregorianDate:
     * Returns a string version of Gregorian date
     * @return String
     */
    public String getGregorianDate()
    {
        return (gYear+"/"+gMonth+"/"+gDay);
    }

    /**
     * getJulianDate:
     * Returns a string version of Julian date
     * @return String
     */
    public String getJulianDate()
    {
        return (juYear+"/"+juMonth+"/"+juDay);
    }

    /**
     * getWeekDayStr:
     * Returns the week day name.
     * @return String
     */
    public String getWeekDayStr()
    {
        String weekDayStr[]={
                "Monday",
                "Tuesday",
                "Wednesday",
                "Thursday",
                "Friday",
                "Saturday",
        "Sunday"};
        return (weekDayStr[getDayOfWeek()]);
    }

    /**
     * toString:
     * Overrides the default toString() method to return all dates.
     * @return String
     */
    public String toString()
    {
        return (getWeekDayStr()+
                ", Gregorian:["+getGregorianDate()+
                "], Julian:["+getJulianDate()+
                "], Iranian:["+getIranianDate()+"]");
    }


    /**
     * getDayOfWeek:
     * Returns the week day number. Monday=0..Sunday=6;
     * @return int
     */
    public int getDayOfWeek()
    {
        return (JDN % 7);
    }

    /**
     * nextDay:
     * Go to next julian day number (JDN) and adjusts the other dates.
     */
    public void nextDay()
    {
        JDN++;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }
    /**
     * nextDay:
     * Overload the nextDay() method to accept the number of days to go ahead and
     * adjusts the other dates accordingly.
     * @param days int
     */
    public void nextDay(int days)
    {
        JDN+=days;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * previousDay:
     * Go to previous julian day number (JDN) and adjusts the otehr dates.
     */
    public void previousDay()
    {
        JDN--;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * previousDay:
     * Overload the previousDay() method to accept the number of days to go backward
     * and adjusts the other dates accordingly.
     * @param days int
     */
    public void previousDay(int days)
    {
        JDN-=days;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * setIranianDate:
     * Sets the date according to the Iranian calendar and adjusts the other dates.
     * @param year int
     * @param month int
     * @param day int
     */
    public void setIranianDate(int year, int month, int day)
    {
        irYear =year;
        irMonth = month;
        irDay = day;
        JDN = IranianDateToJDN();
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * setGregorianDate:
     * Sets the date according to the Gregorian calendar and adjusts the other dates.
     * @param year int
     * @param month int
     * @param day int
     */
    public void setGregorianDate(int year, int month, int day)
    {
        gYear = year;
        gMonth = month;
        gDay = day;
        JDN = gregorianDateToJDN(year,month,day);
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * setJulianDate:
     * Sets the date according to the Julian calendar and adjusts the other dates.
     * @param year int
     * @param month int
     * @param day int
     */
    public void setJulianDate(int year, int month, int day)
    {
        juYear = year;
        juMonth = month;
        juDay = day;
        JDN = julianDateToJDN(year,month,day);
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }

    /**
     * IranianCalendar:
     * This method determines if the Iranian (Jalali) year is leap (366-day long)
     * or is the common year (365 days), and finds the day in March (Gregorian
     * Calendar)of the first day of the Iranian year ('irYear').Iranian year (irYear)
     * ranges from (-61 to 3177).This method will set the following private data
     * members as follows:
     * leap: Number of years since the last leap year (0 to 4)
     * Gy: Gregorian year of the begining of Iranian year
     * march: The March day of Farvardin the 1st (first day of jaYear)
     */
    private void IranianCalendar()
    {
        // Iranian years starting the 33-year rule
        int Breaks[]=
            {-61, 9, 38, 199, 426, 686, 756, 818,1111,1181,
                1210,1635,2060,2097,2192,2262,2324,2394,2456,3178} ;
        int jm,N,leapJ,leapG,jp,j,jump;
        gYear = irYear + 621;
        leapJ = -14;
        jp = Breaks[0];
        // Find the limiting years for the Iranian year 'irYear'
        j=1;
        do{
            jm=Breaks[j];
            jump = jm-jp;
            if (irYear >= jm)
            {
                leapJ += (jump / 33 * 8 + (jump % 33) / 4);
                jp = jm;
            }
            j++;
        } while ((j<20) && (irYear >= jm));
        N = irYear - jp;
        // Find the number of leap years from AD 621 to the begining of the current
        // Iranian year in the Iranian (Jalali) calendar
        leapJ += (N/33 * 8 + ((N % 33) +3)/4);
        if ( ((jump % 33) == 4 ) && ((jump-N)==4))
            leapJ++;
        // And the same in the Gregorian date of Farvardin the first
        leapG = gYear/4 - ((gYear /100 + 1) * 3 / 4) - 150;
        march = 20 + leapJ - leapG;
        // Find how many years have passed since the last leap year
        if ( (jump - N) < 6 )
            N = N - jump + ((jump + 4)/33 * 33);
        leap = (((N+1) % 33)-1) % 4;
        if (leap == -1)
            leap = 4;
    }


    /**
     * IsLeap:
     * This method determines if the Iranian (Jalali) year is leap (366-day long)
     * or is the common year (365 days), and finds the day in March (Gregorian
     * Calendar)of the first day of the Iranian year ('irYear').Iranian year (irYear)
     * ranges from (-61 to 3177).This method will set the following private data
     * members as follows:
     * leap: Number of years since the last leap year (0 to 4)
     * Gy: Gregorian year of the begining of Iranian year
     * march: The March day of Farvardin the 1st (first day of jaYear)
     */
    public boolean IsLeap(int irYear1)
    {
        // Iranian years starting the 33-year rule
        int Breaks[]=
            {-61, 9, 38, 199, 426, 686, 756, 818,1111,1181,
                1210,1635,2060,2097,2192,2262,2324,2394,2456,3178} ;
        int jm,N,leapJ,leapG,jp,j,jump;
        gYear = irYear1 + 621;
        leapJ = -14;
        jp = Breaks[0];
        // Find the limiting years for the Iranian year 'irYear'
        j=1;
        do{
            jm=Breaks[j];
            jump = jm-jp;
            if (irYear1 >= jm)
            {
                leapJ += (jump / 33 * 8 + (jump % 33) / 4);
                jp = jm;
            }
            j++;
        } while ((j<20) && (irYear1 >= jm));
        N = irYear1 - jp;
        // Find the number of leap years from AD 621 to the begining of the current
        // Iranian year in the Iranian (Jalali) calendar
        leapJ += (N/33 * 8 + ((N % 33) +3)/4);
        if ( ((jump % 33) == 4 ) && ((jump-N)==4))
            leapJ++;
        // And the same in the Gregorian date of Farvardin the first
        leapG = gYear/4 - ((gYear /100 + 1) * 3 / 4) - 150;
        march = 20 + leapJ - leapG;
        // Find how many years have passed since the last leap year
        if ( (jump - N) < 6 )
            N = N - jump + ((jump + 4)/33 * 33);
        leap = (((N+1) % 33)-1) % 4;
        if (leap == -1)
            leap = 4;
        if (leap==4 || leap==0)
            return true;
        else
            return false;

    }



    /**
     * IranianDateToJDN:
     * Converts a date of the Iranian calendar to the Julian Day Number. It first
     * invokes the 'IranianCalender' private method to convert the Iranian date to
     * Gregorian date and then returns the Julian Day Number based on the Gregorian
     * date. The Iranian date is obtained from 'irYear'(1-3100),'irMonth'(1-12) and
     * 'irDay'(1-29/31).
     * @return long (Julian Day Number)
     */
    private int IranianDateToJDN()
    {
        IranianCalendar();
        return (gregorianDateToJDN(gYear,3,march)+ (irMonth-1) * 31 - irMonth/7 * (irMonth-7) + irDay -1);
    }

    /**
     * JDNToIranian:
     * Converts the current value of 'JDN' Julian Day Number to a date in the
     * Iranian calendar. The caller should make sure that the current value of
     * 'JDN' is set correctly. This method first converts the JDN to Gregorian
     * calendar and then to Iranian calendar.
     */
    private void JDNToIranian()
    {
        JDNToGregorian();
        irYear = gYear - 621;
        IranianCalendar(); // This invocation will update 'leap' and 'march'
        int JDN1F = gregorianDateToJDN(gYear,3,march);
        int k = JDN - JDN1F;
        if (k >= 0)
        {
            if (k <= 185)
            {
                irMonth = 1 + k/31;
                irDay = (k % 31) + 1;
                return;
            }
            else
                k -= 186;
        }
        else
        {
            irYear--;
            k += 179;
            if (leap == 1)
                k++;
        }
        irMonth = 7 + k/30;
        irDay = (k % 30) + 1;
    }


    /**
     * julianDateToJDN:
     * Calculates the julian day number (JDN) from Julian calendar dates. This
     * integer number corresponds to the noon of the date (i.e. 12 hours of
     * Universal Time). This method was tested to be good (valid) since 1 March,
     * -100100 (of both calendars) up to a few millions (10^6) years into the
     * future. The algorithm is based on D.A.Hatcher, Q.Jl.R.Astron.Soc. 25(1984),
     * 53-55 slightly modified by K.M. Borkowski, Post.Astron. 25(1987), 275-279.
     * @param year int
     * @param month int
     * @param day int
     * @return int
     */
    private int julianDateToJDN(int year, int month, int day)
    {
        return (year + (month - 8) / 6 + 100100) * 1461/4 + (153 * ((month+9) % 12) + 2)/5 + day - 34840408;
    }

    /**
     * JDNToJulian:
     * Calculates Julian calendar dates from the julian day number (JDN) for the
     * period since JDN=-34839655 (i.e. the year -100100 of both calendars) to
     * some millions (10^6) years ahead of the present. The algorithm is based on
     * D.A. Hatcher, Q.Jl.R.Astron.Soc. 25(1984), 53-55 slightly modified by K.M.
     * Borkowski, Post.Astron. 25(1987), 275-279).
     */
    private void JDNToJulian()
    {
        int j= 4 * JDN + 139361631;
        int i= ((j % 1461)/4) * 5 + 308;
        juDay = (i % 153) / 5 + 1;
        juMonth = ((i/153) % 12) + 1;
        juYear = j/1461 - 100100 + (8-juMonth)/6;
    }

    /**
     * gergorianDateToJDN:
     * Calculates the julian day number (JDN) from Gregorian calendar dates. This
     * integer number corresponds to the noon of the date (i.e. 12 hours of
     * Universal Time). This method was tested to be good (valid) since 1 March,
     * -100100 (of both calendars) up to a few millions (10^6) years into the
     * future. The algorithm is based on D.A.Hatcher, Q.Jl.R.Astron.Soc. 25(1984),
     * 53-55 slightly modified by K.M. Borkowski, Post.Astron. 25(1987), 275-279.
     * @param year int
     * @param month int
     * @param day int
     * @return int
     */
    private int gregorianDateToJDN(int year, int month, int day)
    {
        int jdn = (year + (month - 8) / 6 + 100100) * 1461/4 + (153 * ((month+9) % 12) + 2)/5 + day - 34840408;
        jdn = jdn - (year + 100100+(month-8)/6)/100*3/4+752;
        return (jdn);
    }
    /**
     * JDNToGregorian:
     * Calculates Gregorian calendar dates from the julian day number (JDN) for
     * the period since JDN=-34839655 (i.e. the year -100100 of both calendars) to
     * some millions (10^6) years ahead of the present. The algorithm is based on
     * D.A. Hatcher, Q.Jl.R.Astron.Soc. 25(1984), 53-55 slightly modified by K.M.
     * Borkowski, Post.Astron. 25(1987), 275-279).
     */
    private void JDNToGregorian()
    {
        int j= 4 * JDN + 139361631;
        j = j + (((((4* JDN [phone])/146097)*3)/4)*4-3908);
        int i= ((j % 1461)/4) * 5 + 308;
        gDay = (i % 153) / 5 + 1;
        gMonth = ((i/153) % 12) + 1;
        gYear = j/1461 - 100100 + (8-gMonth)/6;
    }


    private int irYear; // Year part of a Iranian date
    private int irMonth; // Month part of a Iranian date
    private int irDay; // Day part of a Iranian date
    private int gYear; // Year part of a Gregorian date
    private int gMonth; // Month part of a Gregorian date
    private int gDay; // Day part of a Gregorian date
    private int juYear; // Year part of a Julian date
    private int juMonth; // Month part of a Julian date
    private int juDay; // Day part of a Julian date
    private int leap; // Number of years since the last leap year (0 to 4)
    private int JDN; // Julian Day Number
    private int march; // The march day of Farvardin the first (First day of jaYear)
} // End of Class 'JavaSource_Calendar

グレゴリオ暦の日、月、年を簡単に設定し、「getIranianDate（）」メソッドを呼び出して、以下のサンプルコードのように日付を文字列形式で取得できます。

MyUtil.CalendarTool ct = new CalendarTool(2012,10,10);
System.out.println(ct.getIranianDate());

役に立てば幸いです。

Answer 3

[〜＃〜] ibm [〜＃〜] 'sUnicode用国際コンポーネント（ icu4j ）。 nicode Consortium の一部であり、非常に信頼性が高く、任意のJavaプロジェクト（Java EE、Java SE、 Androidなど）。 Gradle 、 Maven または単に downloading jarによって。

TL; DR

_import Java.time.Instant;
import Java.time.LocalDateTime;
import Java.time.ZoneId;
import Java.time.ZonedDateTime;
import Java.util.Date;
import com.ibm.icu.text.DateFormat;
import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.ULocale;

public class DateTimeUtils {
    private static final ULocale PERSIAN_LOCALE = new ULocale("fa_IR@calendar=persian");
    private static final ZoneId IRAN_ZONE_ID = ZoneId.of("Asia/Tehran");

    public static Date fromPersianDateToDate(int year, int month, int day, int hour, int minutes, int seconds) {
        return new Date(fromPersianDate(year, month, day, hour, minutes, seconds));
    }

    public static Calendar fromDateToPersianCalendar(Date date) {
        Calendar persianCalendar = Calendar.getInstance(PERSIAN_LOCALE);
        persianCalendar.clear();
        persianCalendar.setTime(date);
        return persianCalendar;
    }

    /**
     * @param date
     * @param field example: Calendar.YEAR, Calendar.MONTH, Calendar.DAY_OF_MONTH, etc
     */
    public static int fromDateToPersianCalendarField(Date date, int field) {
        return fromDateToPersianCalendar(date).get(field);
    }

    public static String fromDateToPersianString(int year, int month, int day, int hour, int minutes, int seconds) {
        return fromDateToPersianString(fromPersianDateToDate(year, month, day, hour, minutes, seconds));
    }

    public static String fromDateToPersianString(Date date) {
        DateFormat df = DateFormat.getDateInstance(DateFormat.FULL, PERSIAN_LOCALE);
        return df.format(date);
    }

    public static LocalDateTime fromPersianDateToLocalDateTime(int year, int month, int day, int hour, int minutes, int seconds) {
        return fromPersianDateToZonedDateTime(year, month, day, hour, minutes, seconds).toLocalDateTime();
    }

    public static ZonedDateTime fromPersianDateToZonedDateTime(int year, int month, int day, int hour, int minutes, int seconds) {
        return toZonedDateTime(fromPersianDate(year, month, day, hour, minutes, seconds));
    }

    public static long fromPersianDate(int year, int month, int day, int hour, int minutes, int seconds) {
        Calendar persianCalendar = Calendar.getInstance(PERSIAN_LOCALE);
        persianCalendar.clear();
        persianCalendar.set(year, month, day, hour, minutes, seconds);
        return persianCalendar.getTimeInMillis();
    }

    public static ZonedDateTime toZonedDateTime(Long epochMilli) {
        if(epochMilli == null) return null;
        return Instant.ofEpochMilli(epochMilli).atZone(IRAN_ZONE_ID);
    }
}
_

使用法：

_import Java.time.LocalDateTime;
import Java.time.ZonedDateTime;
import Java.util.Date;
import com.ibm.icu.util.Calendar;

public class DateTimeUtilsTest {
    public static void main(String[] args) {
        System.out.println("Java 7 and before:");
        Date date = new Date(1467262800000L);
        System.out.println(DateTimeUtils.fromDateToPersianCalendarField(date, Calendar.YEAR));
        System.out.println(DateTimeUtils.fromDateToPersianCalendarField(date, Calendar.MONTH));
        System.out.println(DateTimeUtils.fromDateToPersianCalendarField(date, Calendar.DAY_OF_MONTH));
        Date gregorianDate = DateTimeUtils.fromPersianDateToDate(1395, 3, 10, 9, 30, 0);
        System.out.println(gregorianDate);
        System.out.println(DateTimeUtils.fromDateToPersianString(gregorianDate));

        System.out.println("\n"+"Java 8 onward:");
        ZonedDateTime gregorianZonedDateTime = DateTimeUtils.fromPersianDateToZonedDateTime(1395, 3, 10, 9, 30, 0);
        System.out.println(gregorianZonedDateTime);
        LocalDateTime gregorianLocalDateTime = DateTimeUtils.fromPersianDateToLocalDateTime(1395, 3, 10, 9, 30, 0);
        System.out.println(gregorianLocalDateTime);
    }
}
_

出力：

_Java 7 and before:
1395
3
10
Thu Jun 30 09:30:00 IRDT 2016
۱۳۹۵ تیر ۱۰, پنجشنبه

Java 8 onward:
2016-06-30T09:30+04:30[Asia/Tehran]
2016-06-30T09:30
_

---

より詳細な：

Java 7以前：

他の機能に加えて、_Java.util.Calendar_のすべての機能を期待できます。

_import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.ULocale;

...

ULocale locale = new ULocale("fa_IR@calendar=persian");
Calendar persianCalendar = Calendar.getInstance(locale);
persianCalendar.clear();
persianCalendar.set(1395, 3, 10); // Tir(4th month) 10th 1395 equivalent to June 30th 2016 

Java.util.Date gregorianDate = persianCalendar.getTime();
System.out.println(gregorianDate); // Thu Jun 30 00:00:00 IDT 2016

// Gregorian to Persian
Java.util.Calendar gregorianCal = Java.util.GregorianCalendar.getInstance();
gregorianCal.set(2016, Java.util.Calendar.JUNE, 30);

persianCalendar.setTime(gregorianCal.getTime());
System.out.println(persianCalendar.get(Calendar.YEAR));         // 1395
System.out.println(persianCalendar.get(Calendar.MONTH));        // 3
System.out.println(persianCalendar.get(Calendar.DAY_OF_MONTH)); // 10
_

[〜＃〜] warning [〜＃〜]：月のフィールドはJava calendar by calendar.set(1395, 3, 10)カレンダーは、3年目ではなく、1395年の4月目を表します。

ペルシア語のテキスト出力が必要な場合：

_import com.ibm.icu.text.DateFormat;
import com.ibm.icu.text.SimpleDateFormat;

...

// full date output in persian
DateFormat df = DateFormat.getDateInstance(DateFormat.FULL, locale);
System.out.println(df.format(persianCalendar.getTime()));

// year output in persian
SimpleDateFormat sdf1 = new SimpleDateFormat(SimpleDateFormat.YEAR, locale);
System.out.println(sdf1.format(persianCalendar.getTime()));

// month name output in persian
SimpleDateFormat sdf2 = new SimpleDateFormat(SimpleDateFormat.MONTH, locale);
System.out.println(sdf2.format(persianCalendar.getTime()));

// weekday name output in persian
SimpleDateFormat sdf3 = new SimpleDateFormat(SimpleDateFormat.WEEKDAY, locale);
System.out.println(sdf3.format(persianCalendar.getTime()));

// full date output in YY/MM/dd form
SimpleDateFormat sdf4 = new SimpleDateFormat("YY/MM/dd", locale);
System.out.println(sdf4.format(persianCalendar.getTime()));
_

出力：

_ه‍.ش. ۱۳۹۵ تیر ۱۰, پنجشنبه  
۱۳۹۵  
تیر  
پنجشنبه
۹۵/۰۴/۱۰
_

出力を英語にする必要がある場合は、new ULocale("fa_IR@calendar=persian")をnew ULocale("@calendar=persian")に変更します。

出力：

_AP 1395 Tir 10, Thu
1395
Tir
Thu
95/04/10
_

その他の素晴らしいこと：

_// Get number of days in month
System.out.println(persianCalendar.getActualMaximum(Calendar.DAY_OF_MONTH)); // 31

// Get first day of week
System.out.println(persianCalendar.getFirstDayOfWeek()); // 7 (Saturday according to docs)

// Add some amount of time
persianCalendar.add(Calendar.MONTH, 2);
System.out.println(persianCalendar.get(Calendar.YEAR));         //1395
System.out.println(persianCalendar.get(Calendar.MONTH));        // 5
System.out.println(persianCalendar.get(Calendar.DAY_OF_MONTH)); // 10
_

その他の機能については、 icu4j demos 、特にを参照してください：

• さまざまなカレンダーフィールドのデモ
• 火曜日と木曜日のリスト 現在の年
• 数値をテキスト表現に変換するデモ （ロケールには_fa_IR_を使用）

Calendar および PersianCalendar APIも参照してください。

Java 8以降：

ZonedDateTimeやLocalDateTimeのような_Java.time_クラスを使用するには、このメソッドを使用してペルシャの日付を優先クラスに変換するだけです。

_import Java.time.Instant;
import Java.time.LocalDateTime;
import Java.time.ZoneId;
import Java.time.ZonedDateTime;
import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.ULocale;

...

public static LocalDateTime fromPersianDateToLocalDateTime(int year, int month, int day, int hour, int minutes, int seconds) {
    return fromPersianDateToZonedDateTime(year, month, day, hour, minutes, seconds).toLocalDateTime();
}

public static ZonedDateTime fromPersianDateToZonedDateTime(int year, int month, int day, int hour, int minutes, int seconds) {
    return toZonedDateTime(fromPersianDate(year, month, day, hour, minutes, seconds));
}

public static long fromPersianDate(int year, int month, int day, int hour, int minutes, int seconds) {
    Calendar persianCalendar = Calendar.getInstance(new ULocale("fa_IR@calendar=persian"));
    persianCalendar.clear();
    persianCalendar.set(year, month, day, hour, minutes, seconds);
    return persianCalendar.getTimeInMillis();
}

public static ZonedDateTime toZonedDateTime(Long epochMilli) {
    if(epochMilli == null) return null;
    return Instant.ofEpochMilli(epochMilli).atZone(ZoneId.of("Asia/Tehran"));
}
_

---

瓶サイズについての注意

Icu4jのjarサイズが心配な場合は、再構築してCalendarモジュール（2,176KB）を使用するだけです。詳細： ver。57以前 、 ver。58以降ICU Data Build Tool を使用。

Answer 4

この方法は非常に正確で、単にうるう年もサポートします

説明：

ステップ1：今日の時刻には現在の時刻が含まれます

ステップ2：グレゴリオとジャラリの日を月単位で2つの配列を作成する（g_days_in_month＆j_days_in_month）

ステップ3：カレンダー（gy、gm、Gd）と年の日数の変数g_day_noの間の保持差分時間の変数を作成します。

ステップ4：月の日付を挿入し、日ごとに収集します。

ステップ5：年の日をジャリリ年（jy）に変換する

最後に：日番号からジャラリ月を設定し、月配列のジャラリ日からジャラリ日を設定します。

がんばろう。

    Time today = new Time(Time.getCurrentTimezone());
    today.setToNow();
    int Day = (today.monthDay);             // Day of the month (0-31)
    int Month = (today.month);              // Month (0-11)
    int Year = (today.year);                // Year

    String persianDate = GregorianToJalali(Year, Month+1, Day);

  private String GregorianToJalali(int g_y, int g_m, int g_d)
{

  int[] g_days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  int[] j_days_in_month = {31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29};

    int gy = g_y-1600;
    int gm = g_m-1;
    int Gd = g_d-1;

        int g_day_no = 365*gy+div(gy+3,4)-div(gy+99,100)+div(gy+399,400);

        for (int i=0; i < gm; ++i)
          g_day_no += g_days_in_month[i];
        if (gm>1 && ((gy%4==0 && gy%100!=0) || (gy%400==0)))
         // leap and after Feb 
          g_day_no++;
        g_day_no += Gd;

       int j_day_no = g_day_no-79;

        int j_np = div(j_day_no, 12053); //12053 = 365*33 + 32/4 
        j_day_no = j_day_no % 12053;

        int jy = 979+33*j_np+4*div(j_day_no,1461); // 1461 = 365*4 + 4/4 

        j_day_no %= 1461;

        if (j_day_no >= 366) {
          jy += div(j_day_no-1, 365);
          j_day_no = (j_day_no-1)%365;
        }

        int j;
        for (j=0; j < 11 && j_day_no >= j_days_in_month[j]; ++j)
          j_day_no -= j_days_in_month[j];
       int jm = j+1;
       int jd = j_day_no+1;


        String Result= jy+"/"+jm+"/"+jd;

        return (Result);
     }  


  private int div(float a, float b)
  {  
      return (int)(a/b); 
  }

Answer 5

私のライブラリの最新バージョンv3.10-2015g Time4A （an Android Time4Jの適応）にはJalaliカレンダーのサポートが含まれています。ライブラリは次のアルゴリズムをデプロイします- Borkowski （グレゴリオ暦2129年まで有効）実際にペルシャ語の月と時代（CLDR-28に基づくペルシア語とパシュト語を含む）で約25の言語がサポートされています。

使用例：

// current date
PersianCalendar jalali = SystemClock.inLocalView().now(PersianCalendar.axis());
System.out.println(jalali); // AP-1394-08-04

// tomorrow
jalali = jalali.plus(CalendarDays.ONE);
System.out.println(jalali); // AP-1394-08-05

// localized format of tomorrow (English and Farsi)
ChronoFormatter<PersianCalendar> f =
    ChronoFormatter.ofStyle(DisplayMode.FULL, Locale.ENGLISH, PersianCalendar.axis());
Locale farsi = new Locale("fa");
System.out.println(f.format(jalali)); // Tuesday, Aban 5, 1394 AP
System.out.println(f.with(farsi).format(jalali)); // سه‌شنبه, آبان 5, 1394 ه‍.ش.

// shift back to month Farvardin and format the result
jalali = jalali.with(PersianCalendar.MONTH_OF_YEAR, PersianMonth.FARVARDIN);
System.out.println(f.format(jalali)); // Wednesday, Farvardin 5, 1394 AP
System.out.println(f.with(farsi).format(jalali)); // چهارشنبه, فروردین 5, 1394 ه‍.ش.

// conversion to gregorian date
System.out.println(jalali); // AP-1394-01-05
System.out.println(jalali.transform(PlainDate.class)); // 2015-03-25

// create new year in persian calendar and show gregorian counter part
jalali = PersianCalendar.of(1394, PersianMonth.FARVARDIN, 1);
System.out.println(jalali.transform(PlainDate.class)); // 2015-03-21

// create new year in gregorian calendar and show persian counter part
PlainDate gregorianDate = PlainDate.of(2015, Month.JANUARY, 1);
System.out.println(gregorianDate.transform(PersianCalendar.class)); // AP-1393-10-11

// delta between gregorian new year and persian new year
System.out.println(CalendarDays.between(gregorianDate, jalali).getAmount()); // 79

Android上のJava.util.Dateとの相互運用性

Time4Aは独自の不変型のセットを管理し、Androidの主要な一時型に基づいていないため、次のブリッジを示します。

// Time4A => Android
PlainDate gdate = jalali.transform(PlainDate.class);
Moment m1 = gdate.atStartOfDay().inTimezone(ASIA.TEHRAN);
Java.util.Date jud = TemporalType.Java_UTIL_DATE.from(m1);

// Android => Time4A
Java.util.Date input = new Java.util.Date();
Moment m2 = TemporalType.Java_UTIL_DATE.translate(input);
jalali = m2.toZonalTimestamp(ASIA.TEHRAN).toDate().transform(PersianCalendar.class);

Answer 6

これを試して

import Java.util.Calendar;
import Java.util.Date;
public class PersianCalendar {

String[] weekDayNames = {
        "شنبه","یکشنبه","دوشنبه",
        "سه شنبه", "چهارشنبه",
        "پنج شنبه", "جمعه"
};
String[] monthNames ={
        "فروردین","اردیبهشت","خرداد","تیر", "مرداد","شهریور",
         "مهر", "آبان", "آذر","دی", "بهمن","اسفند"
};   
String strWeekDay = "";
String strMonth = "";    
int day;
int month;
int year;    
int ld;     
Calendar calendar = Calendar.getInstance();      
int gregorianYear =calendar.get(Calendar.YEAR);
int gregorianMonth = calendar.get(Calendar.MONTH)+1;
int gregorianDate = calendar.get(Calendar.DATE);
int WeekDay = calendar.get(Calendar.DAY_OF_WEEK);

int[] buf1 = {0,31,59,90,120,151,181,212,243,273,304,334};
int[] buf2 = {0,31,60, 91,121,152,182, 213, 244, 274,305,335};

public PersianCalendar(){
    Date gregorianDate = new Date();
    calendar.setTime(gregorianDate);
    toPersian(gregorianDate);
}

public PersianCalendar(Date gregorianDate){
    calendar.setTime(gregorianDate);
    toPersian(gregorianDate);
}    

private void toPersian(Date gregorianDate) 
{
    if ((gregorianYear % 4) != 0) 
        func1();
    else 
        func2();
    strMonth = monthNames[month-1];
    strWeekDay = weekDayNames[WeekDay];
}

private void func1()
{
    day = buf1[gregorianMonth - 1] + gregorianDate;
    if (day > 79){
        day = day - 79;
        if (day <= 186) {               
            int day2 = day;
            month = (day2 / 31) + 1;
            day = (day2 % 31);
            if(day2 % 31 == 0){
                 month--;
                 day = 31;
            }                
            year = gregorianYear - 621;
        } 
        else {
            int day2 = day - 186;
            month = (day2 / 30) + 7;
            day = (day2 % 30);
            if(day2 % 30 == 0){
                month = (day2 / 30) + 6;
                day = 30;
            }
            year = gregorianYear - 621;
        }
    } 
    else{            
        ld = gregorianYear > 1996 && gregorianYear % 4 == 1 ? 11 : 10 ;            
        int day2 = day + ld;
        month = (day2 / 30) + 10;
        day = (day2 % 30);            
        if(day2 % 30 == 0)            {
            month--;
            day = 30;
        }
        year = gregorianYear - 622;
    }
}

private void func2()
{
    day = buf2[gregorianMonth - 1] + gregorianDate;     
    ld = gregorianYear >= 1996 ? 79 : 80 ;        
    if (day > ld) {
        day = day - ld;
        if (day <= 186) {
            int day2 = day;
            month = (day2 / 31) + 1;
            day = (day2 % 31);
            if(day2 % 31 == 0){
                month--;
                day = 31;
            }
            year = gregorianYear - 621;
        } else {
            int day2 = day - 186; 
            month = (day2 / 30) + 7;
            day = (day2 % 30);
            if(day2 % 30 == 0 ){
                month--;
                day = 30;
            }
            year = gregorianYear - 621;
        }
    }
    else {
        int day2 = day + 10;
        month = (day2 / 30) + 10;
        day = (day2 % 30);
        if(day2 % 30==0){
            month--;
            day = 30;
        }
        year = gregorianYear - 622;
    }
  }
}

インスタンスを作成する

PersianCalendar sc = new PersianCalendar();            
String s= sc.strWeekDay  + " " +sc.day  + " " + 
     sc.strMonth + " " + sc.year;
System.out.print(s);
//setTitle(s);

Answer 7

双方向DateConverterを含む persianutils プロジェクトがあります。グレゴリオ<->ペルシャ語（ジャラリ語）。これはScalaで記述されているため、Javaプロジェクトで非常に簡単に使用できると思います。

使用されるアルゴリズムは、最大3790までのグレゴリオ暦年および最大3170までのペルシャ年に対して有効です。

免責事項：私はPersianUtilsの著者です

Answer 8

CalculateJalaliDateをそのような関数として作成します。その後、Jalaliの日付を文字列で返します

public String calculateJalaliDate(){

    Calendar c = Calendar.getInstance();
    String jalaliDate,JalaliMonth;
    int jalaliYear,jalaliMonth,calculateMonth,jalaliDay=0,allDays=0;
    int day=c.get(Calendar.DAY_OF_MONTH);
    int month=c.get(Calendar.MONTH)+1;
    int year=c.get(Calendar.YEAR);

    switch (month){
        case 1: allDays=year*365+31+day;break;
        case 2: allDays=year*365+(31+28)+day;break;
        case 3: allDays=year*365+(31+28+31)+day;break;
        case 4: allDays=year*365+(31+28+31+30)+day;break;
        case 5: allDays=year*365+(31+28+31+30+31)+day;break;
        case 6: allDays=year*365+(31+28+31+30+31+30)+day;break;
        case 7: allDays=year*365+(31+28+31+30+31+30+31)+day;break;
        case 8: allDays=year*365+(31+28+31+30+31+30+31+31)+day;break;
        case 9: allDays=year*365+(31+28+31+30+31+30+31+31+30)+day;break;
        case 10: allDays=year*365+(31+28+31+30+31+30+31+31+30+31)+day;break;
        case 11: allDays=year*365+(31+28+31+30+31+30+31+31+30+31+30)+day;break;
        case 12: allDays=year*365+(31+28+31+30+31+30+31+31+30+31+30+31)+day;break;
    }

    //226899
    jalaliYear=( allDays - 227139 )/365+1;
    calculateMonth=( allDays - 227139 )%365;
    if(calculateMonth<32)jalaliMonth=1;
    else if((calculateMonth-31)<32){jalaliMonth=2;jalaliDay=calculateMonth-31;}
    else if((calculateMonth-62)<32){jalaliMonth=3;jalaliDay=calculateMonth-62;}
    else if((calculateMonth-93)<32){jalaliMonth=4;jalaliDay=calculateMonth-93;}
    else if((calculateMonth-124)<32){jalaliMonth=5;jalaliDay=calculateMonth-124;}
    else if((calculateMonth-155)<32){jalaliMonth=6;jalaliDay=calculateMonth-155;}
    else if((calculateMonth-186)<31){jalaliMonth=7;jalaliDay=calculateMonth-186;}
    else if((calculateMonth-216)<31){jalaliMonth=8;jalaliDay=calculateMonth-216;}
    else if((calculateMonth-246)<31){jalaliMonth=9;jalaliDay=calculateMonth-246;}
    else if((calculateMonth-276)<31){jalaliMonth=10;jalaliDay=calculateMonth-276;}
    else if((calculateMonth-306)<31){jalaliMonth=11;jalaliDay=calculateMonth-306;}
    else {
        jalaliMonth=12;
        if((jalaliYear%4)==0)jalaliDay=calculateMonth-336;
        else jalaliDay=calculateMonth-335;
    }



    /*switch (jalaliMonth){
        case 1:JalaliMonth="فروردین"; break;
        case 2:JalaliMonth="اردیبهشت"; break;
        case 3:JalaliMonth="خرداد"; break;
        case 4:JalaliMonth="تیر"; break;
        case 5:JalaliMonth="مرداد"; break;
        case 6:JalaliMonth="شهریور"; break;
        case 7:JalaliMonth="مهر"; break;
        case 8:JalaliMonth="آبان"; break;
        case 9:JalaliMonth="آذر"; break;
        case 10:JalaliMonth="دی"; break;
        case 11:JalaliMonth="بهمن"; break;
        case 12:JalaliMonth="اسفند"; break;
    }*/


    jalaliDate=String.valueOf(jalaliYear)+"/"+String.valueOf(jalaliMonth)+"/"+String.valueOf(jalaliDay);
    return jalaliDate;
}

Answer 9

フォーマッタクラス Roozh for Java でこの安定したテスト済みライブラリを使用できます。非推奨ではなく、ペルシャの日付時刻に必要なクールな機能で常に更新されます。

Answer 10

開発したAndroid hijri-gerogian- shamsiイベントビューを使用したShamsi datepickerウィジェット： https://github.com/irshst/ir.shes.calendar

Answer 11

あまりにも重いライブラリであるTime4A、icu4jのほかに、ペルシャ暦を正確に処理するクラスを作成しました。ここで見つけることができます。 https://github.com/hadilq/Java-persian-calendar/blob/master /persian/src/main/Java/ir/hadilq/PersianCalendar.Java

テストでわかるように、このクラスは、ヒジュラ前の3000年からヒジュラ後の3000年までをサポートしています。